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Finding the Fourth Proportional to 89.51, 123.63 and 79.18

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Solution

The fourth proportional to 89.51, 123.63 and 79.18 is: 109.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.51 : 123.63 = 79.18 : x
  2. Step 2: Convert to fraction form
    89.51/123.63 = 79.18/x
  3. Step 3: Cross multiply
    89.51x = 123.63 × 79.18
  4. Step 4: Simplify right side
    89.51x = 9,788.42
  5. Step 5: Solve for x
    x = 9,788.42/89.51
  6. Step 6: Final answer
    x = 109.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.